Namenda and Viagra drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Namenda (memantine hydrochloride) and Viagra (sildenafil citrate). Common drug interactions include weight increased among females and fall among males.

The phase IV clinical study analyzes what interactions people have when they take Namenda and Viagra. It is created by eHealthMe based on reports of 56 people who take the same drugs from the FDA, and is updated regularly.

What is Namenda?

Namenda has active ingredients of memantine hydrochloride. It is often used in dementia. eHealthMe is studying from 14,283 Namenda users. Check the latest studies of Namenda.

What is Viagra?

Viagra has active ingredients of sildenafil citrate. It is often used in erection problems. eHealthMe is studying from 63,865 Viagra users. Check the latest studies of Viagra.

On Apr, 17, 2026

56 people who take Namenda and Viagra together, and have interactions are studied.

What are the common drug interactions of Namenda and Viagra, by gender? *:

female:

Weight increased
Gastric bypass
Angioedema (rapid swelling of the dermis)
Asthenia (weakness)
Blood pressure decreased
Dehydration (dryness resulting from the removal of water)
Depression
Fatigue (feeling of tiredness)
Heart rate decreased
Therapeutic response decreased (less preventive response)

male:

Fall
Pain
Aspartate aminotransferase increased
Emotional distress
Head injury
Blood alkaline phosphatase increased
Blood bilirubin increased
Brain injury
Concussion (short loss of normal brain function in response to a head injury)
Drug ineffective

What are the common drug interactions of Namenda and Viagra, by age (0-1 to 60+)? *:

0-1:

n/a

2-9:

n/a

10-19:

n/a

20-29:

n/a

30-39:

Alanine aminotransferase increased
Aspartate aminotransferase increased
Asthenia (weakness)
Asthma
Blood alkaline phosphatase increased
Blood creatinine decreased
Blood glucose decreased
Blood urea nitrogen/creatinine ratio increased
Bronchitis (inflammation of the mucous membrane in the bronchial tubes)
Clonus (series of involuntary, rhythmic, muscular contractions and relaxations)

40-49:

Convulsion (muscles contract and relax rapidly and repeatedly, resulting in an uncontrolled shaking of the body)

50-59:

Head injury
Pain
Alanine aminotransferase increased
Aspartate aminotransferase increased
Blood bilirubin increased
Brain injury
Concussion (short loss of normal brain function in response to a head injury)
Contusion (a type of hematoma of tissue in which capillaries)
Dry mouth
Fall

60+:

Nausea (feeling of having an urge to vomit)
Drug ineffective
Urinary tract infection
Dementia alzheimer's type (loss of mental ability with alzheimer's symptom)
Dizziness
Overdose
Pain
Abasia (inability to walk)
Balance disorder
Blood pressure decreased

What are the existing conditions these people have? *

Dementia Alzheimer's Type (loss of mental ability with alzheimer's symptom): 12 people, 21.43%
Pain: 10 people, 17.86%
Multiple Sclerosis (a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath): 9 people, 16.07%
Hiv Infection: 6 people, 10.71%
Arthritis (form of joint disorder that involves inflammation of one or more joints): 6 people, 10.71%
Prostatic Disorder: 5 people, 8.93%
Insomnia (sleeplessness): 5 people, 8.93%
Memory Loss: 4 people, 7.14%
Sleep Disorder: 3 people, 5.36%
High Blood Cholesterol: 3 people, 5.36%

* Approximation only. Some reports may have incomplete information.

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